1. A GROUND-WORKING TOOL COMPRISING AN ELONGATED TUBULAR SHANK, ONE END OF SAID TUBULAR SHANK BEING INTERNALLY THREADED, AN ELONGATED REVERSIBLE SHANK-TYPE DIGGING ELEMENT, SAID ELEMENT INCLUDING AN ELONGATED RODLIKE MEMBER INCLUDLING A CENTER DIAMETRICALLY ENLARGED SHOULDER PORTION DISPOSED BETWEEN ITS OPPOSITE END PORTIONS, THE OPPOSITE END PORTIONS OF SAID ROD-LIKE MEMBER BEING EXTERNALLY THREADED AND SELECTIVELY THREADEDLY ENGAGEABLE IN SAID BORE, THE REMOTE TERMINAL END PORTIONS OF SAID OPPOSITE END PORTIONS BEING ALTERNATELY FULLY TELESCOPINGLY RECEIVABLE IN SAID ONE END OF SAID SHANK, SAID TERMINAL END PORTIONS EACH INCLUDING A WORK-ENGAGING TERMINAL END, ONE END OF SAID ELEMENT BEING TELESCOPED IN SAID ONE END OF SAID SHANK AND THREADEDLY ENGAGED IN SAID BORE WITH THE TERMINAL END OF SAID ONE END OF SAID SHANK ABUTTING SAID SHOULDER, THE OTHER END OF SAID SHANK BEING PARTIALLY FLATTENED AND BIFURCATED AND SAID FURCATIONS BEING GENERALLY PANEL-LIKE IN SHAPE, THE MEDIAL PLANES OF SAID FURCATIONS GENERALLY PARALLELING THE MEDIAL PLANE OF SAID FLATTENED END PORTION, AN EARTH WORKING BLADE CLAMPINGLY SECURED BETWEEN THE FURCATIONS OF SAID BIFURCATED OTHER END OF SAID SHANK.